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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)
$ in Thousands
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Changes in the unrecognized tax benefits    
Gross unrecognized tax benefits at beginning of period $ 823 $ 783
Increase in current year position   40
Increase in prior year position 106  
Decrease in prior year position (50)  
Lapse in statute of limitations (76)  
Gross unrecognized tax benefits at end of period $ 803 $ 823